Kaori Ayase is one of the supporting female characters in both the anime and manga. She is Mizuki Usami's best friend, they are students in the same class.
She is a young 14 years old middle schooler with short blonde hair and orange eyes.
She is a very cheerful girl who would do anything in order to get her ship (Mizuki and Subaru) together, she often teases Mizuki about her crush on Uchimaki, She loves her yo-yo and got depressed when it go ruined.
Mizuki is her best friend and they are students in the same class.